i've seen it loads and i've just played it. something is tellin me it means its optional... but on tabs i'm guessin it wouldnt be there if a song didnt include it?
Correct me if i'm wrong...just telling as my idea for it
Its called a ghost note. You dont hit the note,just position ur finger on tht note during tht moment.
Since if u just land ur finger on the note without hittin it...it will still sound